I know these are the same price at Amazon at the moment, but they are an add on item there, so you have to spend £20 to get them for £1.25, whereas these are this price instore. You do have to add £2 for c+c if you spend under £10 @ Tesco, but if you spend over £10 on toys you can get free home del or c+c. They do have a few other arts / crafts bits half price, will pop links to them in 1st post.
Pritt Stick Rainbow 4 Pack now £2
Bic Kids Tropicolors Colouring Pencils, 12 Pack now £1.50
GL Metallic Style Bead Creations was £10 now £4.85
My Style Shrink & Design Jewellery was £10 now £5
Crayola Paint Maker Refill was £6 now £3
Minions Stationery 52 Piece Art Pack was £10 now £5
Crayola Paint Maker was £23 now £11.50

Designed to create smooth, intense colour
Supertips make thick or thin lines
Official Crayola item. Inks wash off skin & clothing